[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.

Fully unify all of the DMA ops so that subordinate bus types to
the DMA operation providers (such as ebus, isa, of_device) can
work transparently.

Basically, we just make sure that for every system device we
create, the dev->archdata 'iommu' and 'stc' fields are filled
in.

Then we have two platform variants of the DMA ops, one for SUN4U which
actually programs the real hardware, and one for SUN4V which makes
hypervisor calls.

This also fixes the crashes in parport_pc on sparc64, reported by
Meelis Roos.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 110 deletions

diff --git a/include/asm-sparc64/pci.h b/include/asm-sparc64/pci.h
index e11ac10..1393e57 100644
--- a/include/asm-sparc64/pci.h
+++ b/include/asm-sparc64/pci.h
@@ -3,8 +3,7 @@
 
 #ifdef __KERNEL__
 
-#include <linux/fs.h>
-#include <linux/mm.h>
+#include <linux/dma-mapping.h>
 
 /* Can be used to override the logic in pci_scan_bus for skipping
  * already-configured bus numbers - to be used for buggy BIOSes
@@ -30,80 +29,42 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
 	/* We don't do dynamic PCI IRQ allocation */
 }
 
-/* Dynamic DMA mapping stuff.
- */
-
 /* The PCI address space does not equal the physical memory
  * address space.  The networking and block device layers use
  * this boolean for bounce buffer decisions.
  */
 #define PCI_DMA_BUS_IS_PHYS	(0)
 
-#include <asm/scatterlist.h>
-
-struct pci_dev;
-
-struct pci_iommu_ops {
-	void *(*alloc_consistent)(struct pci_dev *, size_t, dma_addr_t *, gfp_t);
-	void (*free_consistent)(struct pci_dev *, size_t, void *, dma_addr_t);
-	dma_addr_t (*map_single)(struct pci_dev *, void *, size_t, int);
-	void (*unmap_single)(struct pci_dev *, dma_addr_t, size_t, int);
-	int (*map_sg)(struct pci_dev *, struct scatterlist *, int, int);
-	void (*unmap_sg)(struct pci_dev *, struct scatterlist *, int, int);
-	void (*dma_sync_single_for_cpu)(struct pci_dev *, dma_addr_t, size_t, int);
-	void (*dma_sync_sg_for_cpu)(struct pci_dev *, struct scatterlist *, int, int);
-};
-
-extern const struct pci_iommu_ops *pci_iommu_ops;
-
-/* Allocate and map kernel buffer using consistent mode DMA for a device.
- * hwdev should be valid struct pci_dev pointer for PCI devices.
- */
-static inline void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
+static inline void *pci_alloc_consistent(struct pci_dev *pdev, size_t size,
+					 dma_addr_t *dma_handle)
 {
-	return pci_iommu_ops->alloc_consistent(hwdev, size, dma_handle, GFP_ATOMIC);
+	return dma_alloc_coherent(&pdev->dev, size, dma_handle, GFP_ATOMIC);
 }
 
-/* Free and unmap a consistent DMA buffer.
- * cpu_addr is what was returned from pci_alloc_consistent,
- * size must be the same as what as passed into pci_alloc_consistent,
- * and likewise dma_addr must be the same as what *dma_addrp was set to.
- *
- * References to the memory and mappings associated with cpu_addr/dma_addr
- * past this call are illegal.
- */
-static inline void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
+static inline void pci_free_consistent(struct pci_dev *pdev, size_t size,
+				       void *vaddr, dma_addr_t dma_handle)
 {
-	return pci_iommu_ops->free_consistent(hwdev, size, vaddr, dma_handle);
+	return dma_free_coherent(&pdev->dev, size, vaddr, dma_handle);
 }
 
-/* Map a single buffer of the indicated size for DMA in streaming mode.
- * The 32-bit bus address to use is returned.
- *
- * Once the device is given the dma address, the device owns this memory
- * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
- */
-static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
+static inline dma_addr_t pci_map_single(struct pci_dev *pdev, void *ptr,
+					size_t size, int direction)
 {
-	return pci_iommu_ops->map_single(hwdev, ptr, size, direction);
+	return dma_map_single(&pdev->dev, ptr, size,
+			      (enum dma_data_direction) direction);
 }
 
-/* Unmap a single streaming mode DMA translation.  The dma_addr and size
- * must match what was provided for in a previous pci_map_single call.  All
- * other usages are undefined.
- *
- * After this call, reads by the cpu to the buffer are guaranteed to see
- * whatever the device wrote there.
- */
-static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction)
+static inline void pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr,
+				    size_t size, int direction)
 {
-	pci_iommu_ops->unmap_single(hwdev, dma_addr, size, direction);
+	dma_unmap_single(&pdev->dev, dma_addr, size,
+			 (enum dma_data_direction) direction);
 }
 
-/* No highmem on sparc64, plus we have an IOMMU, so mapping pages is easy. */
 #define pci_map_page(dev, page, off, size, dir) \
 	pci_map_single(dev, (page_address(page) + (off)), size, dir)
-#define pci_unmap_page(dev,addr,sz,dir) pci_unmap_single(dev,addr,sz,dir)
+#define pci_unmap_page(dev,addr,sz,dir) \
+	pci_unmap_single(dev,addr,sz,dir)
 
 /* pci_unmap_{single,page} is not a nop, thus... */
 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	\
@@ -119,75 +80,48 @@ static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
 #define pci_unmap_len_set(PTR, LEN_NAME, VAL)		\
 	(((PTR)->LEN_NAME) = (VAL))
 
-/* Map a set of buffers described by scatterlist in streaming
- * mode for DMA.  This is the scatter-gather version of the
- * above pci_map_single interface.  Here the scatter gather list
- * elements are each tagged with the appropriate dma address
- * and length.  They are obtained via sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- *       DMA address/length pairs than there are SG table elements.
- *       (for example via virtual mapping capabilities)
- *       The routine returns the number of addr/length pairs actually
- *       used, at most nents.
- *
- * Device ownership issues as mentioned above for pci_map_single are
- * the same here.
- */
-static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+static inline int pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg,
+			     int nents, int direction)
 {
-	return pci_iommu_ops->map_sg(hwdev, sg, nents, direction);
+	return dma_map_sg(&pdev->dev, sg, nents,
+			  (enum dma_data_direction) direction);
 }
 
-/* Unmap a set of streaming mode DMA translations.
- * Again, cpu read rules concerning calls here are the same as for
- * pci_unmap_single() above.
- */
-static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction)
+static inline void pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg,
+				int nents, int direction)
 {
-	pci_iommu_ops->unmap_sg(hwdev, sg, nhwents, direction);
+	dma_unmap_sg(&pdev->dev, sg, nents,
+		     (enum dma_data_direction) direction);
 }
 
-/* Make physical memory consistent for a single
- * streaming mode DMA translation after a transfer.
- *
- * If you perform a pci_map_single() but wish to interrogate the
- * buffer using the cpu, yet do not wish to teardown the PCI dma
- * mapping, you must call this function before doing so.  At the
- * next point you give the PCI dma address back to the card, you
- * must first perform a pci_dma_sync_for_device, and then the
- * device again owns the buffer.
- */
-static inline void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction)
+static inline void pci_dma_sync_single_for_cpu(struct pci_dev *pdev,
+					       dma_addr_t dma_handle,
+					       size_t size, int direction)
 {
-	pci_iommu_ops->dma_sync_single_for_cpu(hwdev, dma_handle, size, direction);
+	dma_sync_single_for_cpu(&pdev->dev, dma_handle, size,
+				(enum dma_data_direction) direction);
 }
 
-static inline void
-pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle,
-			       size_t size, int direction)
+static inline void pci_dma_sync_single_for_device(struct pci_dev *pdev,
+						  dma_addr_t dma_handle,
+						  size_t size, int direction)
 {
 	/* No flushing needed to sync cpu writes to the device.  */
-	BUG_ON(direction == PCI_DMA_NONE);
 }
 
-/* Make physical memory consistent for a set of streaming
- * mode DMA translations after a transfer.
- *
- * The same as pci_dma_sync_single_* but for a scatter-gather list,
- * same rules and usage.
- */
-static inline void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction)
+static inline void pci_dma_sync_sg_for_cpu(struct pci_dev *pdev,
+					   struct scatterlist *sg,
+					   int nents, int direction)
 {
-	pci_iommu_ops->dma_sync_sg_for_cpu(hwdev, sg, nelems, direction);
+	dma_sync_sg_for_cpu(&pdev->dev, sg, nents,
+			    (enum dma_data_direction) direction);
 }
 
-static inline void
-pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg,
-			int nelems, int direction)
+static inline void pci_dma_sync_sg_for_device(struct pci_dev *pdev,
+					      struct scatterlist *sg,
+					      int nelems, int direction)
 {
 	/* No flushing needed to sync cpu writes to the device.  */
-	BUG_ON(direction == PCI_DMA_NONE);
 }
 
 /* Return whether the given PCI device DMA address mask can
@@ -206,11 +140,9 @@ extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);
 #define PCI64_REQUIRED_MASK	(~(dma64_addr_t)0)
 #define PCI64_ADDR_BASE		0xfffc000000000000UL
 
-#define PCI_DMA_ERROR_CODE	(~(dma_addr_t)0x0)
-
 static inline int pci_dma_mapping_error(dma_addr_t dma_addr)
 {
-	return (dma_addr == PCI_DMA_ERROR_CODE);
+	return dma_mapping_error(dma_addr);
 }
 
 #ifdef CONFIG_PCI